Sorry, Sandra Bullock: A Fire Extinguisher Is a Lousy Thruster

Suppose you are an astronaut out in space. You have nothing with you except your wits and … a fire extinguisher? Why a fire extinguisher? Because that’s what Sandra Bullock’s character has in the movie Gravity. Because a fire extinguisher shoots out gas (normally to put out a fire), it can also be used to …

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